Some of my favorite sets I've made in Terraria:
Lewis: a shady potionmaster and artificer
mime mask dyed with red and black dye
leinfors' excessive style dyed with red and black dye
red's leggings with grim dye
yoraiz0r's spell with grim dye in the pet slot, second vanity accessory slot
mana flower with red and silver dye
flower boots with reflective metal dye
yoyo gloves with red and black dye
Victor: a necromancer librarian
arkhalis' hood with purple and black dye. clor of the brim is based on undershirt color, so I tweaked that a bit
crowno's breastplate with purple and black dye
spectre pants with purple and black dye
diamond ring, shackle and arkhalis' lightwings all have shadowflame hades dye
I have no idea what to call him, or what his gimmick is
loki's helmet with orange and black
crowno's breastplate with brown and black dye (maybe it's plain black, I can't remember)
Jim's leggings with brown and silver
flower boots with reflective metal
stardust wings, worm scarf, and yoraiz0r's spell pet slot all with reflective copper
cloud in a bottle with flame and silver dye (possible plain flame)